When your home’s residential HVAC system blows out strange smells in addition to cold air, there’s a problem with it. Different smells indicate different problems, which likely require you to schedule AC repair. But before calling an HVAC contractor, learn what could be causing the foul odor.

4 Residential HVAC Odors & Their Causes

1. Gunpowder

When a circuit shorts or the unit’s fan motor needs repair, the system emits a burning smell similar to that of gunpowder. If not addressed, the system won’t operate as efficiently.

2. Mildew

A mildew smell coming from the residential HVAC system is likely the result of the system failing to properly drain excess moisture. As the system cools your home, it also removes moisture from the air, and when that builds up, it releases an unpleasant smell. Regular AC maintenance like replacing the filters should help, but if the smell doesn’t go away, seek a professional diagnosis.

3. Dirty Socks

“Dirty Sock Syndrome” is common during the hottest months of the year. Ice builds up on your system from frequent use, and the ensuing wet area from the melt contributes to mold and bacteria growth on the system’s coils.

4. Exhaust Fumes

The motor in a residential HVAC system contains fluids intended to keep it running efficiently. When these fluids leak out of the system, they smell like the exhaust fumes generated by vehicles. This issue needs to be addressed before the system breaks down and requires an AC replacement.

 

If your residential HVAC system smells off, contact Air Conditioning Unlimited in Aiea, HI. With more than 20 years of experience, their expert air conditioning contractors will diagnose the source of the smell and provide the necessary AC repairs to fix the issue. Schedule an appointment today by calling (808) 455-3128, or learn more about their offerings online.